Piston-rod connection.



G.B.RBDRUP. PISTON ROD conunonon.

APPLICATION FILED MAY 6, 1911.

Patented Jan. 9, 1912.

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PISTON ROD CONNECTION.

APPLICATION FILED MAY 6, 1911.

1,014,517. Patehtea Jan.9,1912.

2 SHEETS-SHEET 2.

PH CO-VWASHINIJTON n c UNITED STATES PATENT OFFICE.

CHARLES BENJAMIN REIDRUP, 0F CARDIFF, ENGLAND.

PISTON-ROD CONNECTION.

- Application filed May 6, 1911.

To all whom it may concern:

Be it known that 1, CHARLES BENJAMIN REDRUP, a subject of the King ofEngland, residing at Canton, Cardiff, in the county of Glamorgan,\Vales, England, have invented certain new and useful Improvements inPiston-Rod Connections, of which the following is a specification.

This invention is particularly applicable to plungers or pistons havingconnectingrods of the non-cross-head type, such as are now used almostexclusively in internal combustion engines. Rods thus pivoted direct tothe pistons or plungers without a cross-head exert, as is well known,considerable side thrust upon the connecting-rod end of such pistons orplungers and it has been proposed to get over this ditliculty by the useof ball bearings a plied to the piston or various parts mova 1e with thepiston.

According to this invention the anti-friction bearing for the pistontakes the form of one or more rollers so situated that their axes areconcentric with the point about which the connecting-rod pivots. One ormore such rollers may be mounted on the gudgeon-pin the axes of theroller being concentric with the same. \Vhen carried by the gudgeon-pinthe roller or rollers are conveniently mounted on the central portion sothat the ends may be free to engage the piston. When the rollers arecarried by the gudgeonpin they are approximately of the same diameter asthe bore of the barrel or cylinder in which they are employed.

In the accompanying drawings, Figure 1 shows in side elevation ananti-friction device constructed according to one method of carrying outthis invention, the device being mounted in a cylinder which is brokenaway for the sake of clearness; Fig. 2 shows the same anti-frictiondevice in section on aplane coincident with the axis of the gudgeon-pinof the piston, Fig. 3 shows in section on a plane coincident with thegudgeon-pin of the piston an antifriction device constructed accordingto another method of carrying out this invention, and Fig. at shows theparts illustrated in Fig. 3 in perspective and separated from eachother, the piston being partly broken away for the sake of clearness.

Like letters indicate like parts. throughout the accompanying drawings.

The cylinder A may be of any ordinary Specification of Letters Patent.

be substituted for this cylinder.

B, or in the case of a pump, the pump-plum Patented Jan. 9, 1912. SerialNo. 625,532.

construction, that shown being intended for an internal combustionengine, but if the apparatus was a pump, a pump-barrel would The pistonger, has side ears B which carry a gudgeonpin B On the gudgeon-pin aliner B may be mounted and at the center of the gudgeon-pin is mounted aroller C. The connecting-rod D is bifurcatedat D to engage the ends ofthe gudgeon-pin on opposite sides of the roller. The roller isapproximately of the same diameter as the bore of the cylinder A, andthe face C of V the roller, which is intended to bear against theinterior wall of the cylinder, is formed to part of a sphere, sothat itmay fit the cylinder, as will be readily understood.

It will be seen that the thrust of the connecting-rod D when in theposition shown in Fig. 1, would thrust the gudgeon-pin end of the pistonagainst the right-hand side of the interior wall of the cylinder, butthis thrust instead of being borne by the piston is now taken by theroller 0, which rolling on the surface of the cylinder offers much lessresistance than would be afforded by a sliding body such as the piston.

In the construction shown in Figs. 8 and- 4, the roller is divided intotwo parts, or made in the form of two separate rollers E E respectively,placed at opposite ends of the gudgeon-pin F. Each roller is madeapproximately hemispherical, but the rollers do not touch at the center,space being left between them for the connecting-rod G and an arm H thatis carried by the piston H. The connecting-rod G has a head Gr wherebyit is engaged with the gudgeon-pin, and the arm H of the piston isbifurcated at H and engages the gudgeon-pin on opposite sides of thehead G. The operation of this construction of roller is the same as withthe roller C C.

By using an anti-friction bearing-such as constitutes the subject matterof the present invention, the connecting-rod parts can be made shorterthan is usual in practice without unduly increasing the friction due toside thrust. Usually the length of the con necting-rods employed ininternal combustion engines equals the length of stroke multiplied by2.5 whereas in an engine wherein the present invention is employed, thelength of the connecting-rods can be reduced so that they equal thestroke multiplied by 1.5 only, thereby rendering the whole engine morecompact.

It will beunderstood that the two constructions described above, areonly given by way of example and that modifications may be made indetail without departing from the spirit of the invention.

What I claim as my invention and desire to secure by Letters Patentis 1. The combination with a cylinder of a piston therefor, a connectingrod pivotally secured to the piston, and a roller arrangedbeyond thecontacting portion of the piston with the cylinder for engaging thecylinder to prevent the thrust of the connecting rod on the piston,substantially as described.

2. The combination with a cylinder of a piston therefor, a connectingrod pivotally secured to the piston, and rotatable means movable withthe piston and arranged beyond the contacting portion of the piston withthe cylinder for engaging the cylinder to take the thrust of theconnecting rod, substantially as described.

1 3. The combination with the cylinder of a piston therefor, earsprojecting from one end of the piston, a connecting rod pivotallysecured to the ears, and means revoluble a around said pivot pointengaging the wall *of the cylinder for relieving the thrust of theconnecting rod on the piston, substantially as described.

4. The combination with a cylinder of a piston therefor, ears projectingfrom one end of the piston, a transverse pincarried by the ears, aconnecting rod pivoted on the pin, and means, rotatably mounted on thepin and engaging the Wall of the cylinder for relieving the thrust ofthe connecting rod on the piston, substantially as described.

5. The combination with a cylinder of a piston therefor, a transversepin carried by the piston beyond its contacting portion with thecylinder, a connecting rod pivoted on the pin, and hemispherical shapedmembers rotatably mounted on the ends of the pin and engaging the wallof the cylinder for relieving the thrust of the connecting rod on thepiston, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES BENJAMIN REDRUP.

Witnesses:

A. M. HAYWARD, HARRY B. BRIDGES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.-

Washington, D. G.

